<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单 -->
            <el-form ref="loginFormRef" :rules="loginFormRules" class="login_form" :model="loginForm">
                <!-- 用户名 -->
                <el-form-item prop="username">
                <el-input v-model="loginForm.username" prefix-icon="iconfont icon-yonghu"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                <el-input type="password" v-model="loginForm.password" prefix-icon="iconfont icon-mima"></el-input>
                </el-form-item>
                <!-- 按钮区域 -->
                <el-form-item class="btns">
                     <el-button type="primary" plain @click="login">登录</el-button>
                     <el-button type="info" plain @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>

export default{
    data(){
        return{
            //这是登录表单的数据绑定对象
            loginForm :{
                username : 'admin',
                password : '123456'
            },
            //表单的验证规则对象
            loginFormRules : {
                //验证用户名是否合法
                username: [
                    { required: true, message: "请输入用户名",trigger: "blur"},
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                //验证密码是否合法
                password: [
                    { required: true, message: "请输入密码",trigger: "blur"},
                    { min: 6, max: 16, message: '长度在 6 到 16 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods:{
        //重置表单
        resetLoginForm: function(){
            this.$refs.loginFormRef.resetFields()
        },
        login: function(){
            this.$refs.loginFormRef.validate(async valid =>{
                if(!valid) return;
                const {data: res} = await this.$http.post('login',this.loginForm);
                if(res.meta.status !== 200) return this.$message.error('登陆失败')
                this.$message.success('登录成功');
                
                console.log(res);
                window.sessionStorage.setItem('token',res.data.token);
                this.$router.push("/home");
                //1.将登录成功的token 保存到客户端的sessionStorage中
                //1.1 项目中除了登陆之外的其他API接口必须在登录之后才能访问
                // 1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage
                //2. 通过编程式导航跳转到后台主页，路由地址是 /home
            });
        }
    }
}
</script>

<style scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    height: 300px;
    width: 450px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
}
.login_box .avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: rgb(117, 106, 106);
}
.login_box .avatar_box img{
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
}
.btns{
    display: flex;
    justify-content: center;
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
</style>